Billable Code

Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.

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ICD-10 from 2011 - 2016

E05.91 is a billable ICD code used to specify a diagnosis of thyrotoxicosis, unspecified with thyrotoxic crisis or storm. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code E05 is used to code Goitre

A goitre (from the Latin gutteria, struma) is a swelling of the neck or larynx resulting from enlargement of the thyroid gland (thyromegaly), associated with a thyroid gland that is not functioning properly.

Equivalent ICD-9 Code
GENERAL EQUIVALENCE MAPPINGS (GEM)

Thyrotoxicosis without mention of goiter or other cause, with mention of thyrotoxic crisis or storm
(exact match)

This is the official exact match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk.
This means that in all cases where the ICD9 code 242.91 was previously used, E05.91 is the appropriate modern ICD10 code.